Vitting is a term used to describe someone who generally doesn't care anymore. They can be found wearing a flannel with sweatpants and timbs leaving a question as to why they wore a flannel.They will also have likely not shaved in a week and will ignore everyone.

James-Hey Tim you don't seem to be motivated anymore.
Tim-That's because I'm Vitting this week you fucking dumbass.

The act of going out in public wearing sweatpants and a flannel, the flannel attempts to give off a presentable look while the sweatpants bring the look down and neautralize the look giving off an "I don't care" vibe